Abstract
Since Alexander Fleming has discovered antibiotics (penicillin) in 1928 a new era of treatment of many diseases has started. Treatment of lots of diseases takes a new step, which in turn improves morbidity as well as mortality. In old ages, a human had to face many epidemics and pandemics of infectious diseases like typhus, cholera, HIV/AIDS, small-pox, measles, Spanish flu, tuberculosis, etc.
